One example of an epigenetic change in eukaryotic biology is the process of cellular differentiation . During morphogenesis , totipotent stem cells become the various pluripotent cell lines of the embryo , which in turn become fully differentiated cells. In other words, as a single fertilized egg cell – the zygote – continues to divide , the resulting daughter cells change into all the different cell types in an organism, including neurons , muscle cells , epithelium , endothelium of blood vessels , etc., by activating some genes while inhibiting the expression of others. [7]

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